TunnelTech 403 – Extractive NO2, NO and Visibility

The CODEL TunnelTech 403 NO2 NO and Visibility Air Quality Monitor is a compact extractive analyser configured for the continuous measurement of four key parameters in road tunnels. This extremely stable and reliable monitor incorporates an LED to utilise the capacity of Nitrogen Dioxide to absorb UV and blue light to provide accurate readings in parts per billion. It also uses the same sampling system to monitor Visibility using a unique double sensor design.

An electrochemical cell is also added to the sampling cell to measure NO, NO2 , NO and particulate are produced naturally by the combustion processes within the internal combustion engine and are emitted from the exhaust of all types of vehicles.

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